No need of sorry,thankyou for your reply.
we are trying to develop a plugin to browse videos from camroll and other sandboxes in ipad.
could you please guide us how to develop a plugin for livecode(plugin development language compilation,integrations....etc.)

It isn't possible to browse and select videos from within Keynote in iOS either, although that *is* possible in Keynote in Mac OS. It seems Apple doesn't see it as an important function for iOS software to use. :-/